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/* $OpenBSD: nfs_node.c,v 1.60 2014/12/23 04:48:47 tedu Exp $ */
/* $NetBSD: nfs_node.c,v 1.16 1996/02/18 11:53:42 fvdl Exp $ */
/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Rick Macklem at The University of Guelph.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)nfs_node.c 8.6 (Berkeley) 5/22/95
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/timeout.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/lock.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/pool.h>
#include <sys/rwlock.h>
#include <sys/queue.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfs/nfs.h>
#include <nfs/nfsnode.h>
#include <nfs/nfsmount.h>
#include <nfs/nfs_var.h>
struct pool nfs_node_pool;
extern int prtactive;
struct rwlock nfs_hashlock = RWLOCK_INITIALIZER("nfshshlk");
/* XXX */
extern struct vops nfs_vops;
/* filehandle to node lookup. */
static __inline int
nfsnode_cmp(const struct nfsnode *a, const struct nfsnode *b)
{
if (a->n_fhsize != b->n_fhsize)
return (a->n_fhsize - b->n_fhsize);
return (memcmp(a->n_fhp, b->n_fhp, a->n_fhsize));
}
RB_PROTOTYPE(nfs_nodetree, nfsnode, n_entry, nfsnode_cmp);
RB_GENERATE(nfs_nodetree, nfsnode, n_entry, nfsnode_cmp);
/*
* Look up a vnode/nfsnode by file handle.
* Callers must check for mount points!!
* In all cases, a pointer to a
* nfsnode structure is returned.
*/
int
nfs_nget(struct mount *mnt, nfsfh_t *fh, int fhsize, struct nfsnode **npp)
{
struct nfsmount *nmp;
struct nfsnode *np, find, *np2;
struct vnode *vp, *nvp;
struct proc *p = curproc; /* XXX */
int error;
nmp = VFSTONFS(mnt);
loop:
rw_enter_write(&nfs_hashlock);
find.n_fhp = fh;
find.n_fhsize = fhsize;
np = RB_FIND(nfs_nodetree, &nmp->nm_ntree, &find);
if (np != NULL) {
rw_exit_write(&nfs_hashlock);
vp = NFSTOV(np);
error = vget(vp, LK_EXCLUSIVE, p);
if (error)
goto loop;
*npp = np;
return (0);
}
/*
* getnewvnode() could recycle a vnode, potentially formerly
* owned by NFS. This will cause a VOP_RECLAIM() to happen,
* which will cause recursive locking, so we unlock before
* calling getnewvnode() lock again afterwards, but must check
* to see if this nfsnode has been added while we did not hold
* the lock.
*/
rw_exit_write(&nfs_hashlock);
error = getnewvnode(VT_NFS, mnt, &nfs_vops, &nvp);
if (error) {
*npp = NULL;
return (error);
}
/* grab one of these too while we're outside the lock */
np2 = pool_get(&nfs_node_pool, PR_WAITOK | PR_ZERO);
/* note that we don't have this vnode set up completely yet */
rw_enter_write(&nfs_hashlock);
nvp->v_flag |= VLARVAL;
np = RB_FIND(nfs_nodetree, &nmp->nm_ntree, &find);
/* lost race. undo and repeat */
if (np != NULL) {
pool_put(&nfs_node_pool, np2);
vgone(nvp);
rw_exit_write(&nfs_hashlock);
goto loop;
}
vp = nvp;
np = np2;
vp->v_data = np;
/* we now have an nfsnode on this vnode */
vp->v_flag &= ~VLARVAL;
np->n_vnode = vp;
rw_init(&np->n_commitlock, "nfs_commitlk");
/*
* Are we getting the root? If so, make sure the vnode flags
* are correct
*/
if ((fhsize == nmp->nm_fhsize) && !bcmp(fh, nmp->nm_fh, fhsize)) {
if (vp->v_type == VNON)
vp->v_type = VDIR;
vp->v_flag |= VROOT;
}
np->n_fhp = &np->n_fh;
bcopy(fh, np->n_fhp, fhsize);
np->n_fhsize = fhsize;
np2 = RB_INSERT(nfs_nodetree, &nmp->nm_ntree, np);
KASSERT(np2 == NULL);
np->n_accstamp = -1;
rw_exit(&nfs_hashlock);
*npp = np;
return (0);
}
int
nfs_inactive(void *v)
{
struct vop_inactive_args *ap = v;
struct nfsnode *np;
struct sillyrename *sp;
#ifdef DIAGNOSTIC
if (prtactive && ap->a_vp->v_usecount != 0)
vprint("nfs_inactive: pushing active", ap->a_vp);
#endif
if (ap->a_vp->v_flag & VLARVAL)
/*
* vnode was incompletely set up, just return
* as we are throwing it away.
*/
return(0);
#ifdef DIAGNOSTIC
if (ap->a_vp->v_data == NULL)
panic("NULL v_data (no nfsnode set up?) in vnode %p",
ap->a_vp);
#endif
np = VTONFS(ap->a_vp);
if (ap->a_vp->v_type != VDIR) {
sp = np->n_sillyrename;
np->n_sillyrename = NULL;
} else
sp = NULL;
if (sp) {
/*
* Remove the silly file that was rename'd earlier
*/
nfs_vinvalbuf(ap->a_vp, 0, sp->s_cred, curproc);
nfs_removeit(sp);
crfree(sp->s_cred);
vrele(sp->s_dvp);
free(sp, M_NFSREQ, sizeof(*sp));
}
np->n_flag &= (NMODIFIED | NFLUSHINPROG | NFLUSHWANT);
VOP_UNLOCK(ap->a_vp, 0, ap->a_p);
return (0);
}
/*
* Reclaim an nfsnode so that it can be used for other purposes.
*/
int
nfs_reclaim(void *v)
{
struct vop_reclaim_args *ap = v;
struct vnode *vp = ap->a_vp;
struct nfsmount *nmp;
struct nfsnode *np = VTONFS(vp);
#ifdef DIAGNOSTIC
if (prtactive && vp->v_usecount != 0)
vprint("nfs_reclaim: pushing active", vp);
#endif
if (ap->a_vp->v_flag & VLARVAL)
/*
* vnode was incompletely set up, just return
* as we are throwing it away.
*/
return(0);
#ifdef DIAGNOSTIC
if (ap->a_vp->v_data == NULL)
panic("NULL v_data (no nfsnode set up?) in vnode %p",
ap->a_vp);
#endif
nmp = VFSTONFS(vp->v_mount);
rw_enter_write(&nfs_hashlock);
RB_REMOVE(nfs_nodetree, &nmp->nm_ntree, np);
rw_exit_write(&nfs_hashlock);
if (np->n_rcred)
crfree(np->n_rcred);
if (np->n_wcred)
crfree(np->n_wcred);
cache_purge(vp);
pool_put(&nfs_node_pool, vp->v_data);
vp->v_data = NULL;
return (0);
}
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